At the end of the 1800s, the united states was unable to expand trade with china because japan controlled most of china. japan and other imperialist nations controlled china. japan blocked us ships from reaching pacific ports. japan and anti-imperialists in the us government blocked trade with china.

Japan and other imperialist nations controlled China.

Explanation:

The japanese controlled China and many other countries in Asia, mainly the pacific islands, including parts of Russia and main ports in South east china, this helped to prevent more american trade with Chinese ports and helped expand the Japanese empire and gave them great wealth before the start of world war I.

Japan and other imperialist nations controlled China

Explanation: i took test on edge! 100%