Which trend has made it difficult for the federal government to continue supporting great society programs? a decrease in federal tax revenue a drop in the average age of the population a steady decrease in voter turnout rates among the elderly a steady decline in domestic manufacturing

The trend that made it difficult for the federal government to continue supporting great society programs was:  a decrease in federal tax revenue
Great societies program planned to give various government funded welfare programs for the citizens, and to actually make this plan successful, the government need A LOT of tax revenue.