The u. s. congress banned trade with which of the following countries in response to the policy of apartheid? nicaragua south africa el salvador soviet union

The U.S. Congress banned trade with South Africa  

Explanation:

With the end of the Apartheid Act of 1948, which was an extended part of racial discrimination that existed earlier, the foreign relations with U.S. had come to an end.  The attempt to integrate South African supremacy over Southern Africa has failed in the year 1970, which put an end to the foreign intervention in Angola and Namibia.  

As a result of Sharpeville Massacre, South Africa was abandoned from UN for their apartheid policies. US congress forced in maintaining distance between the two countries in almost every aspect as well as trade.

these conditions long with a short growing season made farming difficult.

explanation:

the north has a climate of warm summers and snowy cold winters. the terrain is rocky, hilly, and not good for farming.