What does the author mean by the phrase "build up"?

How did the roaring 20s mark the end of the progressive era? a. mass production reduced wealth disparity and turned public opinion pro business b. labor unions won big legislative gains in workers rights and disbanded c. public officials cut taxes on businesses and reduced spending on services d. america increasing influence in world affairs redirected public attention to foreign policy

Hideki tojo's government in japan was similar to totalitarian governments in germany and italy in that it

The eastern roman empire is also known as what empire