The British Proclamationof 1763, the war of 1812, geological barriers and the lack of modern-day transportation all provided resistance against westward migration.
英国1763年公告、1812年战争、地理阻隔和现代交通的缺少都对向西迁移产生了阻碍。
2
The proclamation applied only to areas under Confederate control, and its legal impact was uncertain, but it redefined the nature of the war and was of great symbolic significance.