Cultural 2010's eras

The Switch launch, fidget spinners, and YouTube new logo were also key points of 2017 being a late 10s year. I'll say by spring 2017 we were in the late 10s but music wise 2018 is the year where we started to feel removed from the mid 10s.

^Yep I agree. September 2017 was the key month in the transition and after that the mid 2010s were gone.

Just curious, if World War II began in September 1939, why don't you include 1939 and 1940 as being part of 1940s culture?

Winter 2009/2010 to Summer 2013: Early 2010s
The depths of the Great Recession, an era in which the youth of the world listened overwhelmingly to carefree club music as an escape from their financial hardship. Dance-electronica had become so popular that it forced r&b legends from the 2000s like Usher to change genres. Emo fashion had declined but nothing had really come in to replace it yet. iPhones entered the mainstream, but weren't yet entirely standard. American politics are dominated by Obama's battle against the Tea Party. Gay marriage becomes one of the hottest social topics to date, largely because a solid number of countries and US states are finally legalizing it. Overseas, there was hope for better days in the Middle East, thanks to the Arab Spring, as well as the conclusion of the Iraq War and killing of Osama Bin Laden, though of course this optimism would ultimately be shattered by things to come. Some of the definitive television shows of this era include Breaking Bad, My Little Pony: Friendship Is Magic (complete with its Brony subculture...), Glee, Borgen, Epic Rap Battles of History, Downton Abbey, Parks and Recreation, and Boardwalk Empire. YouTube is at its height of popularity, having become more corporate but also producing its most diverse, high-quality material.

Autumn 2013 to November 7, 2016: Mid-2010s
A much grimmer sub-era than its predecessor, in spite of the economy improving. Domestic terrorism because a serious concern to people, beginning with the Boston Marathon Bombing and continuing to events such as Paris, London, and San Bernardino. ISIS is the biggest enemy of the free world. In music, club music gradually declines from popularity but still remains relevant to some degree, while trap music steadily emerges the new norm. Kid culture is dominated by Frozen, in addition to the Minions reaching their height of popularity and both Marvel and Star Wars dominating the toy sections of stores. Netflix goes from a popular pastime to the major arbiter of television entertainment, having begun to produce original content of its own to bold success and quickly inspiring Amazon to do the same. This era's most definitive shows include Gravity Falls, House of Cards, Orphan Black, and Transparent, though time will tell whatever other shows still popular now won't have much staying power in the late 2010s. Social media is no longer just standard, it's an all-consumer monster. Hashtags are now a constant sight, and Snapchat and Instagram have both taken some popularity away from Facebook. Vine is a big fad of this period. Social justice culture enters full throttle, beginning with the college rape culture controversy and expanding to Black Lives Matter, transgender activism, immigration, and gun control debates. This overwhelmingly turbulent period unfortunately gives rise to the alt-right, who become increasingly influential to the Republican Party, as well as conservative political parties outside the United States. Fashion sees the stark rise of hi-top fades, pompadours, thrift shop attire, and thick-rimmed glasses. The Marvel Cinematic Universe reigned supreme over the movie industry.

November 8, 2016 to present: Late 2010s
Culturally, I think we most likely only just finished the transition into this sub-era around October or November, but the real tipping point was clearly the night Trump was elected President of the United States. Since then, there has been both a rise in hateful repudiation of the progressive achievements of the Obama Administration, as well as a very prominent pro-diversity backlash against Trumpism, evident in multicultural themed advertisements and a variety of other media pieces. The two huge television shows of this era are Stranger Things and This Is Us. Quite ironically, in spite of Donald Trump being the American President, 2017 has been extremely dominated by Latin American culture influencing general trends, with "Despacito (Remix)" being the huge summer anthem worldwide and clearly becoming the next "Livin' la Vida Loca," having led to several other latin pop songs reaching massive chart success and led stars such as Demi Lovato and Camila Cabello, the latter of which seems to be the face of late 2010s pop so far, to fully embrace their Latina heritage in their most recent hit singles. Additionally, the movie Coco has gotten a resoundingly positive response thus far. The Weinstein Effect and #MeToo campaign seem to be a major turning point for attitudes towards rape culture, as in taking down the Weinstein Company, a variety of shows and films, and numerous careers, people seem to be finally recognizing a very firm line when it comes to sexual advances, which may significantly impact the nature of popular media that either achieves great success or flops on its arse. The success of the cinematic It movie, in conjunction with Stranger Things' popularity, will likely lead to many more films and shows to follow a generally similar style of 80s retroism and adolescent-themed horror-comedy.

While I'm in the November 8, 2016 as late '10s camp, I will say spring 2017 is really when I felt the difference. That difference was the explosion of bedroom pop. That may sound silly, but just all of a sudden in April or so, the Mac DeMarcos and Rex Orange Countys of YouTube were just popping out of the woodwork thanks