<human>:  What are the biggest differences between the US and Canada?
<bot>: The biggest differences between the US and Canada include their government, culture, geography, and climate. The US is a federal republic, with a president as its head of state, while Canada is a parliamentary democracy with a constitutional monarchy, headed by the British monarch. Culturally, Canada has a distinct way of life, with its own media, language, and cuisine, whereas the US has a melting pot culture with influences from all over the world. Geographically, the US is much larger than Canada, while Canada has more coastline as well as expansive mountain ranges. Finally, the climate in the two countries varies significantly, with Canada generally having cooler temperatures year-round.