Appropriate, maybe, that the first clue today should mention tea (1A: Indian state that exports tea (ASSAM)), because ... well, you know why. Although the tea dumped in 1773 by the Sons of Liberty was from China, not India. Still, ...
Also appropriate for the date is today's revealer, HAPPYFOURTH. The other four (also appropriate) theme answers each provide, in their last word, the fourth in a series. Numbers being the fourth book in the Bible, Time being the fourth dimension, Delta the fourth letter in the Greek alphabet, and Mars the fourth planet from our Sun. Pleasing. The only thing I find odd about it is the "Annual greeting" part. When did that start? I don't say it isn't true, because earlier today, as Frannie and I walked along the beach at low tide, people actually said this to us when passing. "Happy Fourth." Is this a new thing? I don't really remember it from my youth. But then, there are many such things.
In addition to the theme, I liked much in the fill today: PSHAW (22A: "Oh, hogwash!") and OODLES (44A: Gobs) are excellent. LOPED (55A: Ran gracefully), and ALBEIT (32A: Notwithstanding) are enjoyably unusual. CREAM clued as "Destroy, as an opponent" got a chuckle. And how many of you tried to make a three-letter abbreviation for "size" when confronted with 59A: Small, medium or large: Abbr. (ADJ)? I sure did.
The two "father/son" (LENNON/LEE) clues were nice, and "19A: Blue expanse" could have been sky or SEA, so that caused a little slowdown. Also slowing me down (this seemed tough for a Wednesday) was spelling SABER with an "re" instead of an "er." And cluing COB with a male swan instead of a Fourth of July staple was shocking!
ISPY lots to like today. I hope you're having a pleasant holiday.