A: The positive role of 1: The closed-door policy has a certain effect on the western colonial forces.

2. Negative influence: it restricts the development of China's foreign trade and shipping; Obstruct cultural exchanges between China and foreign countries; We can't just turn China into a contrast of power and an invasion by low-level colonial forces; Further leading to stagnation and retrogression, and keeping China away from the world trend.

Why did the Qing dynasty close its doors at that time?

A: 1 In the early Qing Dynasty, the natural economy was stable and there was no need for foreign goods, which led to the arrogance and complacency of the rulers.

Be wary and suspicious of western colonialists, violate the values of western invasion and safeguard national security.

Close the door or give you motivation?

Da: We should learn from others and develop ourselves.