Alfred Wegener was a German meteorologist and scientist who in the early 20th century, proposed the theory of "continental drift", which states that the continents used to be joint and they have been drifting away from one another.
His theory was rejected by the scientific community, because although it is based on findings of both plants and animal species in matching sides of different continents, it lacks an explanation regarding what forces, make the continents drift.
The Battle of Okinawa<span> was significant in that it served as an example of how deadly the invasion of mainland Japan would be. The </span>Battle of Okinawa<span> was the largest amphibious invasion of the Pacific campaign and the last major campaign of the Pacific </span>War<span>, which lasted from April 1 to June 22, 1945. After they realized how deadly the invasion would be for U.S troops they decided to use the Nukes.</span><span />
Europe embarks on an age of exploration (1400)
Britain and Spain establish colonies in north and south America (1700)
the industrial revolution leads to the rapid increase of industries in Europe (18th -19th century)
european nations begin establishing colonies in africa (19th century)
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States should decide the issue of slavery
These books are called Period pieces