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

How did the crop lien system trap some farmers in a cycle of debt

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a.seismic waves kill microoganisms b.seismic waves disrupts the sand and causes seafloor erosion c.seismic waves have virtually no adverse affects on marine life d.seismic waves damage the sonar that dolphins and whales use to orient themselves underwater

Why did china build the great wall of china?