Final answer:
Ticket splitting was most prominent during the 1970s, a time characterized by a high degree of bipartisanship and moderate voting records in Congress, facilitating cooperation across party lines.
Step-by-step explanation:
Ticket splitting was most prominent during the 1970s. During this decade, many pieces of legislation were passed with reasonably high levels of support from both major political parties, indicating a higher level of bipartisanship.
Also, most members of Congress had relatively moderate voting records during the 1970s, enabling cooperation through compromise. This context of bipartisanship and moderate politics made ticket splitting, where voters choose candidates from different parties for different offices within the same election, more likely during this decade.