How did the Soviets cause Americans fear in 1961? How did the us respond?

With the building of Berlin Wall. Americans strongly opposed the building of the wall and further division of Germany.

Explanation:

On August 13, 1961 East German authorities began setting up barbed wire and street obstacles on the border with Berlin's west. It was the beginning of the construction of the Berlin Wall, which in the years that followed became a symbol of the division between the western and eastern blocs. A symbol of the Cold War.