One main reason why individual party members in the House have been more willing to accept strong party leadership since the 1970s is that the members of each party have become:

Question

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Over the past few decades, the parties have become more ideologically cohesive, meaning that there is less variety in political views among party members. This makes it easier for party leaders to enforce discipline and establish a stronger leadership role within their respective caucuses.

One Main Reason Why Individual Party Members in the House