Japan's invasion of china in the 1930s was primarily undertaken to 1. aid chinese nationalists 2. halt communism in china 3. acquire industrial resources 4. stabilize the chinese government

this isn't a question and if you're going to list things be kind and use commas.

he sent troops to protect the students as they entered the school.

during world war ii                                                      

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.