How has the population of underdeveloped countries changed since 1950?

The correct answer to this open question is the following.

The population of underdeveloped countries has dramatically changed since 1950. It has increased rapidly, and in some cases has doubled or tripled, according to some underdeveloping countries.

Each underdeveloping country has is special cases. But generally speaking, these countries had decreased the mortality rate since the 1950s, which has allowed them to reduce diseases and increases the years lived by their citizens. Another key issue is the lack of a well-planned natality program that controls families having children. There are cases such as México, Argentina or Brazil that have dramatically increased their population since the 1950s.

the growing interconnectedness of the world through communication, trade, and the exchange of ideas is an important theme in the history of the 20th and 21st centuries.

explanation:

the alfred thayer mahan award for literary achievement is awarded each year by the navy league of the united states. the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation. presented since 1957, "this award for literary achievement is awarded to a u.s. navy officer, u.s. marine corps officer, enlisted service member, or civilian who has made a notable literary contribution that has advanced the knowledge of the importance of sea power in the united states."[1]