The belief that workers of the world unite to overthrow their oppressors is central to... A. Socialism
B. Communism
C. Conservatism
D. Laissez-fairs capitalism.
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The belief that workers of the world would unite to overthrow their oppressors is central to. (1) Socialism

Explanation:

 I'm pretty sure its A hope this helps :) ≧◇≦

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

d: their own individual powers within the new goverment