The United States is a country made up of fifty states located in North America. It has a very long, complicated history that dates back to the 1700s. From 1865 to 1918, the United States was a nation of tremendous growth and change.
After the Civil War ended in 1865, the United States government worked to rebuild the country. They passed laws called the Reconstruction Acts which allowed for rights of African Americans and freedom for slaves. The 13th Amendment also prohibited slavery.
At the end of the 1800s, the United States also experienced a period of growth called the Industrial Revolution. This was when factories and businesses built machines that increased production and made life easier. Industry, engineering, and technology all grew during this time.
The United States also became more powerful when it acquired part of Spain's territory in 1898. The U.S. won this land after the Spanish American War. This new land included Hawaii and Puerto Rico, which are now part of the United States.
In 1917, the United States declared war on Germany and joined World War I. Back then, the United States was called The Great War. The U.S. participated in this war as a leader and helped end it just one year later.
By 1918, the United States had gone from an agricultural nation to a major industrial superpower. It had expanded from sea to shining sea, doubling the size of its original landmass. The United States was a leader in world affairs, starting the 1920s with more international influence than ever before.