Why was it so important to the South’s Civil War effort that Texas maintain control of its ports

Because through the port, they were supplying their troops.

Explanation:

Texas was one of the critical areas of the Confederate troops. A supply of armaments and horses ran through Texas through Confederate soldiers. Until mid-1863. Texas had an essential function in those above. Namely, soon the boats of the Union would control the river, which was a critical moment in the war.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation: