Analysts predict that slowing population growth will present "a number of economic challenges" over the next 50 years, such as paying for rising healthcare costs for aging populations.

UK Prime Minister calls for a multi-year transition deal that would end in 2021.

UK Prime Minister calls for a multi-year transition deal that would end in 2021.

British elections raised questions over hard Brexit plans.

British elections raised questions over hard Brexit plans.

U.K. Prime Minister's notification sets off two years of negotiations.

U.K. Prime Minister's notification sets off two years of negotiations.

Increasing chance seen of negotiations breaking down.