Imagine you are giving a speech to your class about reasons why the united states rapidly formed over a dozen states in the west between 1850 and 1900. which event would be best to use as supporting evidence in your speech?

The completion of the Transcontinental Railroad in 1869

Explanation:

The Transcontinental railroad was completed in 1869 uniting the Union Pacific and Central Pacific railroads. This made the transcontinental railroad travel possible for the first time. This made traveling easier, safer and quicker. The railroad had 2,000 miles of track and now a journey that could take months would take only days. This had a huge impact on population, cattle, plantations and all. Following this, the US rapidly grew and expanded and formed a series of states.

a king decides to declare war on a neighboring country without the input of any advisers