Please remember that, depending on your nationality, you may need a visa or travel authorisation. If you already have this, then please also make sure that your passport information is up to date and has at least 6 months before it expires, as many countries require this.
Some citizens may not need a visa, but they must complete a travel authorisation form, called an ESTA for the United States or an eTA (Electronic Travel Authorization) for Canada.
Check online if you require travel authorisation for the United States or Canada.