United States was the world's economic leader after World War 1.
What is United States?
The United States of America (U.S.A. or USA), also referred to as the United States (U.S. or US) or simply as America, is a transcontinental nation with its main territory in North America.
There are 50 states in total, a federal district, 5 significant unincorporated territories, 326 Indian reservations, and 9 small offshore islands.
In terms of both total area and land area, it is the third-largest nation. The United States has maritime boundaries with the Bahamas, Cuba, and Russia, as well as shared land borders with Canada to the north and Mexico to the south.
It is the third most populous nation in the world, with a population of more than 331 million. The most populous metropolis and financial hub is New York City, while Washington, D.C., serves as the nation's capital.
What was World War 1?
The First World War, also known as World War I or just WWI, started on July 28, 1914, and lasted until November 11, 1918. Its participants comprised much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with conflict also spreading into the Middle East, Africa, and some regions of Asia.
It was known by its contemporaries as the "Great War." One of the worst wars in history, nearly 5 million civilians died from military occupation, bombing, famine, and illness, while an estimated 9 million died in combat.
Genocide within the Ottoman Empire and the 1918 influenza pandemic, which was made worse by the movement of soldiers during the war, resulted in millions of extra deaths.
Hence, option B is correct.
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