Question

The early period after World War I is also known as the

Answer 1

Reconstruction period
The period after the Civil War, 1865 - 1877, was called the Reconstruction period. Abraham Lincoln started planning for the reconstruction of the South during the Civil War as Union soldiers occupied huge areas of the South.

Answer 2

The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.