Can someone finish the sentence

In the 20th century, the frenzy of competition between Industrial Powers exploded into the deadliest conflict in human history, the .

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

it is the dominance of   the spanish language and roman catholic region in mexico, french being the official language of several african countries, and the existence of a western-style government in south asian countries

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.