In the years preceding world war i
a)world tensions declined.
b)military expenditures decreased.
c)imperialistic ambitions seemed to decline.
d)there was a series of international crises.

The correct answer is D) there was a series of international crises.

In the years preceding World War I there was a series of international crises.

The world was in turmoil in different parts before World War I. The spark that could have generated an international confrontation could have been anywhere. For instance, there was the Moroccan Crisis of 1905. Or the Crisis in Bosnia in 1908. There was another period of crisis in Morocco in 1911. And what was definitively a most problematic issue was the war at the Balkans in 1912. Let's remember that World War I started after the assassination of Austrian Archduke Franz Ferdinand and his wife, in Sarajevo, on June 28, 1914.

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.