Cold War tensions between the United States and the Soviet Union resulted in both nations: -leaving the United Nations.
-hosting rival U. N. meetings.
-blocking the other's allies from joining the U. N. General Assembly.
-vetoing resolutions favorable to the other in the U. N. Security Council.

Vetoing others resolutions.

Explanation:

Neither side left the UN, hosted rival meetings, or blocked each other's allies from entering, but both did use their power in the security council and influence of their allies to veto each other's resolutions.

idk

explanation:

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.