Party systems are most common in the english-speaking countries of the world.

Two-party systems are most common in the English-speaking countries of the world.

Explanation:

A two-party system is a system of political parties that favors the emergence of two political coalitions (usually antagonistic in the political spectrum) to generate exclusion or positive discrimination of political minorities, and in all elections one of them it reaches the government of the nation and the other occupies the second place in the preferences of vote, happening to be the official opposition to the government. Its defenders argue that it generates political stability by excluding extremist sectors that could achieve parliamentary or presidential representation. On the contrary, its detractors argue that the fact that it excludes these minorities is undemocratic.

c. legislation should seek to resolve social problems.

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this