Which of the following describes a major difference between U.S. and British political parties?

U.S. parties are indeed characterized by a greater degree of ideological diversity and lower levels of cohesion compared to British political parties. This can be attributed to several factors, including the structure of the electoral system and the historical evolution of the party systems in both countries.

In the U.S., the two dominant parties—the Democratic and Republican parties—encompass a wide range of beliefs and ideologies. For instance, within the Democratic Party, there are moderate centrists as well as more progressive representatives, while the Republican Party includes both traditional conservatives and more extreme right-wing factions. This ideological diversity can lead to intra-party debates and factions, resulting in lower cohesion as party members may prioritize their own beliefs over party unity.

In contrast, British political parties, such as the Labour Party and the Conservative Party, tend to maintain more coherent party ideologies and discipline, as party members usually align more closely with the party's platform. This cohesion is often reinforced by the parliamentary system, where party alignment is crucial for maintaining support and governance.

The other aspects of party dynamics mentioned in the incorrect choices highlight differences in party organization and electoral processes that do not apply to the U.S. context in the same way.