By the beginning of the twentieth century, astronomers had some idea of the size and shape of our galaxy, though the consensus was that the galaxy represented the entirety of the Universe. But in the decades that followed, it became clear that the Universe was much more.

By the beginning of the twentieth century, the younger generation of nationalists had become impatient with its elders' polite political agitation and sought ways to increase the pressure on the British to grant Indians more autonomy.

Britain's control over India was not the main reason the UK rose to become the superpower of the 19th century, but the wealth extracted from India preserved British supremacy for decades longer than otherwise would have been possible, but at a terrible cost to the Indians.

In 1858, the British government took direct control over India. This was supposed to cure the injustices of Company administration, but life in India grew worse, not better.

India is one of the world's oldest nations. In the early 18th century, it was the world's largest economy. By the end of that century, it was entirely under the control of a foreign multinational corporation.

In the two years since the Armistice, virtually nothing had gone right in the United States. In 1920, voters chose the candidate who promised a return to normalcy.

By 1923, inflation was raging in Germany, and so was the right wing.

When reparations payments first came due in 1921, the German economy was in bad shape and the government resisted payment, while the German right opposed paying them at all.

Germany receives the Treaty of Versailles and is given the choice of accepting the treaty as it stands, or restarting the war.

Imposing an indemnity on the defeated enemy after a war was a longstanding practice. At the Paris Peace Conference, reparations were supposed to be something more just and civilized: a charge for losses to civilians during the German occupation of Belgium and France.