Although portrayed as a positive movement to open the territory west of the Mississippi to westward expansion by Anglo settlers, the Indian Removal Act resulted in the brutal death of many natives who refused to go peacefully.不太懂粗体部分的结构和意思。
Think this through very carefully before you write so that what you say shows a natural progressive from past experience to the job you are applying for.这句话的natural progressive要怎么理解?