Final answer:
Zeta Beta Tau (ZBT) fraternity expanded by merging with three other houses: Phi Alpha in 1959, Kappa Nu in 1961, and Phi Sigma Delta in 1969, each bringing their unique legacies to the combined fraternity.
Step-by-step explanation:
Zeta Beta Tau (ZBT) is a fraternity known for its rich history and expansion through the merger with other fraternities. The specific houses that merged into ZBT include Phi Alpha, Phi Sigma Delta, and Kappa Nu. These mergers helped strengthen ZBT's presence on college campuses and broadened its alumni network. Phi Alpha merged with ZBT in 1959, bringing its traditions and history into the fraternity. Shortly after, in 1961, Kappa Nu also joined ZBT, and this was followed by Phi Sigma Delta in 1969. Each of these fraternities brought their own unique legacies and values, contributing to the diverse culture of ZBT today.
The synergies created by integrating the histories, traditions, and brotherhoods from these various fraternities have positioned Zeta Beta Tau as a prominent and inclusive brotherhood in the Greek community.