Millions of Americans can now claim Canadian citizenship by descent. But they have to prove it.

Bill C-3, which came into effect Dec. 15, removes the first-generation limit to citizenship

A new piece from CBC on the coming into force of the legislative changes to Canadian citizenship by descent.

A couple of interesting points from further down the article:

Vermette says many Franco-Americans have long felt invisible on both sides of the border.

He believes Bill C-3 presents Quebec with a unique opportunity to repatriate or reclaim those who feel a connection to the province’s culture and language, even amid heightened controversy surrounding immigration and pressures linked to cultural and linguistic preservation.

"The Franco-American population is an untapped natural resource for Quebec," he said. . .

In a statement to CBC, the IRCC said it does not have an exact estimate of how many people might be affected by Bill C-3, but says it expects tens of thousands of requests for Canadian citizenship certificates over time. 

According to the IRCC website, at the beginning of March, almost 48,000 people were waiting for a decision pertaining to their certificate application, with an estimated processing time of 11 months.