The main purpose of studying abroad is emigration.
出国留学的主要目的是移居海外（移民）。
望采纳， 谢谢！

“美国入境处”英语怎么说？

3 楼的，你搞错了。ICE 移民及海关执法处是执法机构，抓非法移民的。

管理入境和移民的是
USCIS . UNITED STATES CITIZENSHIP AND IMMIGRATION SERVICES 美国公民及移民服务处

在飞机场里执法和管理移民入境业务的是
US CBP - US CUSTOM AND BORDER PROTECTION 美国海关及边境防卫部

ICE 不会在飞机场里执法和管理移民入境业务的

怎么留学移民加拿大

What kind of approach are you looking for? There are so many ways and programs that you can immigrate to Canada.

What you mentioned in your question, seems like you want to study in Canada first and then immigrate. You can apply universityies in Canada after you sucessfully graduate from high school, and have 3 year transcript and diploma, graduation exams results. You will need probably study English first, and then university. When you graduate from university, you can apply an open work permit for up to 3 years, find a good job, and then immigrate as a skilled worker via PNP or CEC.

As you said, the policy could change anytime. I feel it's getting tighter. But there's no need to worry right now, since you are so young. You need a good plan. I think you will be fine.

Good luck, and remember you have to do this step by step.