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美国是当今世界最发达的国家,其本土的开发是由东向西推进的。18世纪中叶到19世纪中叶美掀起两次大规模的由东向西的拓殖运动,此后美开发西部及南部的步伐从未停止。通过开发,西部农业首先得到蓬勃发展,成为美国的“小麦王国”、“棉花王国”及“畜牧王国”,为美成为世界农业大国奠定了坚实基础。此后,工业迅速发展,
The United States is the most developed country in the world today and the development of its homeland is advancing east to west. Since the mid-18th century to the mid-1800s, the United States set off two large-scale colonization campaigns from the east to the west. Since then, the pace of the western and southern development of the United States has never stopped. Through the development of agriculture, western agriculture first flourished and became the “wheat kingdom”, “cotton kingdom” and “livestock kingdom” in the United States, laying a solid foundation for the United States to become the world’s largest agricultural country. Since then, the rapid development of industry,