Kenseikai

Led by Katō Takaaki, the new party was united by its opposition to the policies of the ruling Rikken Seiyūkai under Prime Minister Ōkuma Shigenobu.

The merger gave the Kenseikai a total of 198 seats in the Lower House of the Diet of Japan, thus forming a majority, and raised the expectation that Katō Takaaki would become the next prime minister.

During its period in the opposition, the Kenseikai strongly opposed the Siberian Intervention and pushed for greater rights for labor unions.

[1] In the 1924 General Election, the Kenseikai secured 150 seats, making it the largest single party in the Lower House, but without a majority.

Following Katō's death, the party was led by Wakatsuki Reijirō, but his cabinet was unable to weather the Shōwa financial crisis of 1927.