What is the marco polo bridge incident, and how did it impact Asia in 1937?

The Marco Polo bridge incident was the conflict between Chinese and Japanese troops near the M. P bridge, outside Beijing.

Which impacted Asia by it developed into the warfare between two countries that was the prelude to the Pacific side of World War II.

In 1931 Japan occupied Machuria and established the puppet state of Manchuko, spending large sums to develop the region's industry and continuing to expand their occupation into northern China around Beijing and Tianjin. This violation of China's territorial integrity produced a growing anti-Japanese movement in China.

By 1937, this movement had grown so strong that the Chinese communists and Nationalists agreed to end their civil war and form a United Form against further Japanese aggression.