Westward Expansion had a profound and lasting impact on the development of the United States as a nation. It transformed the country both geographically and economically, shaping the future trajectory of American history.

One significant legacy of Westward Expansion is the establishment of new states and territories. As settlers moved westward, they founded communities, built infrastructure, and established governments, leading to the eventual admission of new states such as California, Oregon, and Texas. This expansion of the United States' territorial boundaries played a crucial role in solidifying the nation's position as a continental power.

Furthermore, Westward Expansion greatly stimulated economic development. The discovery of valuable resources, such as gold in California and silver in Nevada, spurred migration and economic growth. The construction of transcontinental railroads connected the eastern and western parts of the country, facilitating trade and commerce on an unprecedented scale. These economic advancements propelled the United States into becoming one of the world's leading industrial nations.

Another lasting legacy of Westward Expansion is the cultural and social impact it had on American society. As pioneers and settlers moved west, they brought with them their customs, traditions, and ideas, creating a diverse and vibrant tapestry of cultures across the country. The expansion westward also provided opportunities for women to exert their independence and contribute to their communities, such as through participating in suffrage movements and advocating for educational reforms.

In conclusion, the legacy of Westward Expansion is profound and multi-faceted. It transformed the United States both physically and economically, leading to the growth of new states, the development of infrastructure, and the stimulation of economic progress. Moreover, it fostered cultural diversity and opportunities for social change. Understanding the legacy of Westward Expansion is essential to comprehending the foundations of the United States as a nation.