What is the main difference between party system in the USA and Britain and the French party system?

The party system of the United States and Britain can be called a bipartisan system, and France has a multi-party system.

How can we characterize the French two-round majority system?

The French two-round majority system is a compromise between plurality and proportional representation that provides much needed stability.

What does the French majority system allow for?

The French majority system still allows for the wide range of ideological beliefs that citizens hold.

What are the most influential parties in France?

The most influential parties in France are: The Union for a Popular Movement, The Union for French Democracy,The Socialist Party, The French Communist Party, The Greens, The National Front, Rally for the Republic (RPR), The Left Radical Party.