What does push factor mean

What best describes the transportation within cities in the early 1800s

Why did president johnson decide not to run for reelection in 1968?

Which of the following best describes the outcome of the bay of pigs invasion? -it ended in a draw despite strong air support from the united states. -it was a partial success that to resolve the cuban missile crisis. -it was a success and created hostility between cuba and the soviet union. -it was a failure that was an embarrassment for the kennedy administration.