The 11 biggest marches and protests in American history

Since Trump has taken office, his first orders as president have sparked a wave of activism around the US.

On April 22, hundreds of thousands will come out for the Scientists' March on Washington, while many more are expected to protest at the People's Climate March a week later.

The efforts will follow local rallies in cities around the country, as well as two large NYC strikes from groups that could be affected by President Donald Trump's executive order that would temporarily bar immigrants and refugees from seven majority-Muslim countries.

But the biggest one-day protest after Trump's inauguration was the Women's March, which drew around a half million people in DC.

"In the spirit of democracy and honoring the champions of human rights, dignity, and justice who have come before us, we join in diversity to show our presence in numbers too great to ignore," the Women March's site reads.

Here's a look back at some of the biggest marches in American history.