What to know about King Charles' Canada speech and how it relates to Trump

• The speech outlined, among other subjects, Canada's economic and security relationship with the United States.
• It will also showed the shared history between Canada and England — in contrast to the relationship with the country along its southern border.

State of play: This trip marks Charles' first visit to Canada as head of state. He'll deliver a "Speech from the Throne," which marks the start of a new session of Parliament.

• Though Charles delivered the speech, it was actually written by the prime minister's office, as is tradition for commonwealth countries, per the New York Times.
• Charles' address marked the third time that the British monarch has delivered the opening speech to Canada's Parliament. Queen Elizabeth II, Charles' mother and predecessor, gave the speech twice during her reign in 1957 and 1977.
• Trump's repeated threats to the U.S. prompted Carney to invite Charles to deliver the speech, per AP.

Context: Marking the start of Parliament with a speech is a longstanding tradition, but it's uncommon for the monarch to deliver it.

• Usually, the king's representative in Canada, the governor-general, would speak on his behalf.
• Canada's House of Commons and Senate can't conduct any public business before the "Speech from the Throne" is delivered.

What they're saying: "The Royal Visit is a reminder of the bond between Canada and the Crown – one forged over generations, shaped by shared histories, and grounded in common values," Prime Minister Mark Carney said in a statement.

• "A bond that, over time, has evolved, just as Canada has, to reflect the strength, diversity, and confidence of our people."

Go deeper: Canada's "old relationship" with the U.S. is over, newly elected prime minister says