While the US is closing doors, Canada has been rolling out the welcome mat. Since 2013, the number of tech jobs in Toronto has skyrocketed from about 148,000 to 228,000, an increase of 54%.

"We have over 100,000 people immigrate to the Toronto region each year, which is twice as many as San Francisco Bay Area," Jason Goldlist, cofounder of TechToronto, said. And we don't just attract the quantity. It's also quality because a fifth of these immigrants already have a STEM degree before they even arrive here.

Canadian e-commerce giant Shopify is trying to capitalize on the opportunity. Following Trump's announcement, CEO Tobias Lutke — himself an immigrant from Germany — tweeted, "If this affects your plans consider coming to Canada instead."

Read more here