What was the cause of economic growth in the 1950s ?

The growth of domestic consumerism. - Apex

The Vietnam War had far-reaching consequences for the United States. It led Congress to replace the military draft with an all-volunteer force and the country to reduce the voting age to 18. It also inspired Congress to attack the "imperial" presidency through the War Powers Act, restricting a president's ability to send American forces into combat without explicit Congressional approval. Meanwhile, hundreds of thousands of Vietnamese refugees have helped restore blighted urban neighborhoods.