North America comprises 23 sovereign states and numerous territories—each with its own political system. There is no single "North American government." Here are the predominant models:
United States, Mexico – Directly elected president serves as head of state and government; separation of powers; federal structure.
Canada – King/Queen (represented by Governor General) is ceremonial head of state; Prime Minister (elected by Parliament) runs government; federal provinces.
Jamaica, Bahamas, Belize, Antigua & Barbuda, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Grenada – Similar to Canada but unitary (not federal); share the British monarch as head of state.
Dominica, Trinidad & Tobago – Ceremonial president; executive power rests with Prime Minister and Cabinet responsible to legislature.
Most are electoral democracies (Cuba excepted). All have written constitutions, independent judiciaries (varying degrees), and multi-party systems (except Cuba). Regional bodies (OAS, CARICOM, USMCA) provide coordination.
North America's governance is a mosaic—not a monolith.