Where did the sit-in movement start? who started it?

The Greensboro sit-in was a civil rights protest that started in 1960, when young African-American students staged a sit-in at a segregated Woolworth's lunch counter in Greensboro, North Carolina, and refused to leave after being denied service. The sit-in movement soon spread to college towns throughout the South.

Explanation:

the enslaved people onboard suffered from illness with some frequency

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.