How has the occurrence of divided governments changed since the 1920s?

The correct choice highlights that the occurrence of divided governments has steadily increased since the 1920s. A divided government occurs when one party controls the presidency while another party controls one or both chambers of Congress. Historically, the trend has shown that as political polarization has intensified, divided governments have become more common, particularly in recent decades.

From the 1920s through the mid-20th century, it was more frequent for one party to hold both the presidency and Congress, but various factors, such as increased partisanship, changes in voter behavior, and demographic shifts, have contributed to the current landscape where divided governments are often the norm. This trend reflects the complexities of the American political system and the evolving dynamics of party control, ultimately indicating a significant shift since the 1920s.