How did the US cause a crisis in Cuba?

It depends which Cuban crisis you are talking about. The United States has invaded Cuba twice. The first time was from sinking a military ship. Maybe you have heard of the Rough Riders? They were a volunteer group that was lead by Teddy Roosevelt (before he was president) that was part of the first invasion. The other invasion was during the Cold War. The Invasion was called the Bay of Pigs. Cuba was allied with Russia and threatening the United States with Nuclear weapons.