Respuesta :
Manifest Destiny, it was gods will to own land from sea to shining sea. Also the construction of the Transcontinental Railroad, connecting the east to the west
Answer:
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.