What was the cause of the trend in spending that the graph shows in the 1960s?

I would like a graph please, it does not show on your question

Explanation:

a is the final : )

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.