2. The tension in Europe between the United States and Soviet Union following World War I was escalated with Cuba's involvement because

O Castro's relationship with Khrushchev appeared to be a threat to America's safety.
Kennedy attempted to create alliances with Cuba in order to overthrow the Soviet Union.
O Kennedy ordered an invasion of the Soviet Union off the northern coast of Russia.
• Castro supported Khrushchev's efforts to secretly invade the United States off the Gulf Coast.

The correct answer is: Castro's relationship with Khrushchev appeared to be a threat to America's safety.

To understand why the tension in Europe between the United States and Soviet Union following World War II escalated with Cuba's involvement, we need to examine the historical context.

After World War II, the world was divided into two major power blocs - the United States and its allies (Western Bloc) and the Soviet Union and its allies (Eastern Bloc). This division, known as the Cold War, was characterized by intense ideological rivalry and a race for global influence.

In the early 1960s, Fidel Castro led a revolution in Cuba and established a communist regime. This alarmed the United States, as it saw communism as a direct threat to its interests and security. The United States and the Soviet Union were already engaged in a nuclear arms race, with both countries constantly trying to gain an advantage over the other.

The Soviet leader at the time, Nikita Khrushchev, saw an opportunity to expand Soviet influence in the Western Hemisphere by establishing a strategic relationship with Cuba. Khrushchev believed that by placing Soviet missiles on the island, he could counterbalance the United States' nuclear capabilities.

In 1962, the United States discovered that the Soviet Union was secretly installing nuclear missiles in Cuba. This discovery triggered a major crisis known as the Cuban Missile Crisis. The United States considered the presence of these missiles a direct threat to its national security.

President John F. Kennedy, responding to the situation, ordered a naval blockade around Cuba and demanded the removal of the missiles. The crisis brought the world to the brink of nuclear war, with tensions between the United States and the Soviet Union reaching their peak.

In the end, the crisis was resolved through negotiations, with both sides reaching a compromise. The United States agreed not to invade Cuba, and the Soviet Union agreed to remove its missiles from the island.

Therefore, the tension in Europe between the United States and Soviet Union following World War II escalated with Cuba's involvement because Castro's relationship with Khrushchev (the leader of the Soviet Union) appeared to be a threat to America's safety.