What of these helped to further the westward expansion in the US after 1865?

After 1865, several factors contributed to the further westward expansion in the US, including the completion of the Transcontinental Railroad, which facilitated transportation and trade. The Homestead Act of 1862 encouraged settlement by offering land to settlers willing to farm it. Additionally, the discovery of gold and other minerals in the West attracted prospectors and settlers. These elements combined to promote migration and economic development in western territories.