Answer:
The effect of the British declaring war and forcing China to sign trade agreements in 1839 was:
Both imports and exports increased.
Based on the line graph showing British trade with China from 1815 to 1845, we see:
- Exports to China (things Britain sold to China) increased from 6 million pounds in 1815 to 10 million pounds in 1845.
- Imports from China (things Britain bought from China) increased from 13 million pounds in 1815 to 17 million pounds in 1845.
So after the British became more Imperialistic and aggressive in China in 1839 by declaring war and imposing trade agreements, both British exports to China and imports from China continued to increase. This suggests the intervention and forced trade agreements opened up more trade opportunities that benefited both sides.