Speaker Nancy Pelosi (D-Calif.) is ending her long leadership tenure with an historic flourish, wrapping up two decades at the top of the party with a string of major victories — political, legislative and diplomatic — that are putting a remarkable cap on a landmark era. This week alone, House Democrats have released the tax records of former President Trump following a years-long legal battle. They wrapped up their marathon investigation into last year’s Capitol attack, complete with criminal referrals for Trump. And they’re poised to pass a massive, $1.7 trillion federal spending bill packed full of Democratic priorities, including...