Which timespan had the most tension during the cold war and why PLEASE HELP

2. what was the significance of the british reform act of 1832? members of the middle class were permitted to run for parliament. members of the working class demanded and received better living conditions. voters were given the right to vote by secret ballot, farm workers, factory workers, and women were given the right to vote.

Answer the questions in the image for zoom in to read : )

Did the both the us and ussr have atomic weapons after 1949