In 1939, the United States had renounced its trade treaty with Japan; and, beginning with an aviation gasoline ban in July 1940, Japan became subject to increasing economic pressure. During this time, Japan launched its first attack against Changsha, a strategically important Chinese city, but was repulsed by late September. Despite several offensives by both sides, the war between China and Japan was stalemated by 1940. To increase pressure on China by blocking supply routes, and to better position Japanese forces in the event of a war with the Western powers, Japan invaded and occupied northern Indochina. Afterwards, the United States embargoed iron, steel and mechanical parts against Japan. Other sanctions soon followed. Chinese nationalist forces launched a large-scale counter-offensive in early 1940. In August, Chinese communists launched an offensive in Central China; in retaliation, Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists. Continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941, effectively ending their co-operation. In March, the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao. In September, Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces.

Question: What did the US stop selling to Japan in 1940?
Answer: aviation gasoline

Question: What did Japan attack in the Battle of Shanggao?
Answer: Chinese 19th army

Question: How many different metals did the United States embargo against Japan?
Answer: 2

Question: How many years passed between the United States renouncing its treaty with japan and the aviation gasoline ban?
Answer: 1

Question: Which happened first, the aviation gasoline ban or the first attack on Changsha?
Answer: aviation gasoline ban

Question: When was the Battle of Shanggao?
Answer: March 1941

Question: When did Japan attempt to take the city of Changsha?
Answer: September 1941

Question: Which happened first, Japan's invasion of Indochina or the US steel embargo against Japan?
Answer: Japan's invasion of Indochina

Question: Which did the US refuse to trade to Japan first, aviation gasoline or iron?
Answer: aviation gasoline

Question: Which event happened first, the United states emabrgoed iron and steel against Japan or an aviation gasoline ban against the Japanese was made?
Answer: aviation gasoline ban

Question: How many years after the United States renounced its trade treaty with Japan did Japan launch it's first attack against China?
Answer: 1

Question: In what year did the Battle of Shanggao occur?
Answer: 1941

Question: Which army was not repulsed during Battle of Shanggao, Japanese or Chinese 19th army?
Answer: Chinese 19th army

Question: How many times did Japan attempt to take the city of Changsha?
Answer: 2