VOY 3x8,3x9,3x10,3x11, and 3x12. I haven't seen Voyager since it originally aired and my partner has never seen it. This is a really interesting point in the series for me.
The good: the doctor gets the mobile emitter. This is the first really big change in the show structure and more doctor is always better. Plus, Future's End (3x8 and 3x9) is a really fun 2-parter with great guests.
The bad: the lack of character or circumstance development really starts to drag by this point. I know there's the big shakeup at the end of season 3 and I'm extremely ready for it. Warlord (3x10) tries to be a big Kes episode to circle back to her psychic powers but like everything it goes nowhere. Not to mention I know her story goes nowhere so it's hard to be excited about anything she does.
Manifest Destiny is pretty much that. The US fought Mexico, Spain, and British Canada, exploited the political situation in Europe to buy a huge chunk of land from France, and displaced or killed hundreds of thousands of native people. The US is the 4th largest country by area. Having that much contiguous land is insanely valuable and powerful. By the time the US would have even had to think about colonizing like the Europeans it was going out of style.