16th Amendment (1913) gave Congress the power to levy an income tax.
Midterm elections have much more of a national policy focus, placing much more power in the House Speaker and minority and majority leaders.
Reduction of power
Foreign policy is increasingly controlled by the president who has the power to initiate ‘military actions’ such as the Vietnam war and recent interventions in Afghanistan, Iraq, and Syria.
In recent years there has been less cooperation between the two parties. If there is a divided Congress without cooperation, legislation is less likely to pass through both houses and Congress will pass few laws.
reduced power- executive orders
Presidents are using executive orders more to pass legislation, bypassing Congress.
If the President’s party controls either house, executive orders are less likely to be challenged.
The presidency has become a “bully pulpit” to shape public opinion.
Donald Trump used Twitter to influence and shape public opinion.