The United Kingdom has officially left the European Union after 47 years of membership, in a step cast by Prime Minister Boris Johnson as the dawn of new era.

Boris Johnson, Britain’s blustering Brexit campaigner, was chosen as the U.K.’s next prime minister on Tuesday, with a resounding mandate from the Conservative Party but conflicting demands from a politically divided country.

More than 6 million people have signed a petition asking the British government to cancel Brexit.

The pound fell Friday after Britain's parliament again rejected a proposed deal to withdraw from the European Union.

Senior Conservative becomes third minister to walk out over Theresa May’s Brexit plan