How is organizing history by period different from organizing history by theme?
O A. A historian who organizes history by period studies the
characteristics of a specific time, whereas a historian who
organizes history by theme studies a big idea that occurs over an
extended length of time.
O B. A historian who organizes history by period studies a specific area
of the world, whereas a historian who organizes history by theme
studies the characteristics of a specific length of time.
O C. A historian who organizes history by period studies a big idea that
occurs over an extended length of time, whereas a historian who
organizes history by theme studies a specific area of the world.
O D. A historian who organizes history by period studies the
characteristics of a specific length of time, whereas a historiah
who organizes history by theme studies a specific civilization.

A. A historian who organizes the past by region focuses on a specific start and end date, whereas a historian who organizes the past by period focuses on the most influential individuals.

Explanation:

To the extent that history is continuous and inapplicable, all systems of periodization are additional or less impulsive. However without named periods, but clumsy or inaccurate, the diversion would be nothing but dispersed events without a structure to assist people to perceive them

The correct answer is C) the U.S. push to promote democracy around the world.

One post-war goal of the United States that created tension with Russia was the U.S. push to promote democracy around the world.

After World War II, the United States was committed to promoting democracy around the world which meant that they should prevent the spread of Communist in other nations of the planet. This U.S. goal generated a lot of conflicts with the Soviet Union that considered the opposite. The USRR wanted to spread Communism in other nations. This clash of ideologies created moments of tension during the Cold War such as the Cuban Missile Crisis of October 1962. So it is true that one post-war goal of the United States that created tension with Russia was the U.S. push to promote democracy around the world.