April 1952

Monday 07:

The manga Astro Boy debuts in the monthly magazine Shōnen.

Tuesday 08:

In a radio address to the nation from the White House, President Harry S. Truman calls for the seizure of all steel mills in the United States in order to prevent a nationwide strike.

Monday 21:

Secretaries Day (now Administrative Professionals' Day) is first celebrated.

Monday 28:

Occupied Japan: The United States occupation of Japan ends.