Thanks to the international dateline, New Zealand was the first to rally, complete with reminders of New Zealand's place in the history of political representation for women.
In London, a crowd filled Trafalgar Square.
All across the United States, women took to the streets
Social media - and streets - struggled to contain the marchers.
But it wasn't just big cities.
In the tiny town of Alpine Texas, the women's march marched up a mountain: pic.twitter.com/NhCMpYKYLH— Anne Helen Petersen (@annehelen) January 21, 2017
Nor good weather.
THEY MARCHED AGAINST HIM IN ANTARCTICA https://t.co/Vj6HZn7hcV— Liz Meriwether (@lizmeriwether) January 21, 2017
And, of course, politicians got in on the act.
Thanks for standing, speaking & marching for our values @womensmarch. Important as ever. I truly believe we're always Stronger Together.— Hillary Clinton (@HillaryClinton) January 21, 2017
President Trump, you made a big mistake. By trying to divide us up by race, religion, gender and nationality you actually brought us closer. pic.twitter.com/U7deCCTFx9— Bernie Sanders (@SenSanders) January 21, 2017
This is a good question.
Somebody write an analysis of how social media has made protestors' signs wittier in general— annkpowers (@annkpowers) January 21, 2017
But the question that many are asking now, is... what next?
Stop asking if the #WomensMarch 'will achieve anything in the long run.' It already has. Millions of women feel less beaten today.— Laurie Penny (@PennyRed) January 21, 2017
BREAKING: Trump has resigned from President b/c of all the women protesting today.— Tennessee GOP (@TEN_GOP) January 22, 2017
Fact check: No, he is still YOUR President.#WomensMarch
That was incredible. I'm grateful to every single person who showed up. pic.twitter.com/3UT9suSUSq— Kathryn Schulz (@kathrynschulz) January 22, 2017