From 1830 onwards in the USA and from about 1870 in Canada, settlers began to move westwards and to take possession of the plains as their own.
美国自1830年起,加拿大从1870年左右起,殖民者开始向西迁移,并把平原据为己有。
Second, if your friends have problems, do not give advice. Ask questions instead, such as What do yo want? How do you feel about it? What are you afraid might happen? They will be able to find answers to any problems themselves, with your support. They