If you have a Canadian visa, can you enter the United States without a visa? If you immigrate to Canada, is it convenient to enter the United States?

A few years ago, Canadian Maple Leaf Card and international students in Canada were granted visa-free access to the United States. At present, new Canadian immigrants or international students who want to enter the United States must apply for an American visa, which is relatively easier than applying from the mainland, but many Canadian immigrants are refused visas to enter the United States. Only maple leaf card holders who immigrated and lived in Canada for at least 2 years can easily enter the United States.