Celebrate Presidents' Day

Across

1To prevent something from happening or from being successful (informal) (6)
4A concept or idea not associated with any specific instance (8)
9A ribbonlike strip of pasta (6)
10Breaking loose (8)
12Happening in the course of time or events, usually much later (8)
13Extreme care in spending money (6)
15A period of time containing 365 (or 366) days (4)
16"Father" of the country (10)
19Covers the calves and is typically worn by a dancer during practice (10)
20Talcum powder ( informal ) (4)
23Give information or notice to (6)
25For skimming over water towed by a speedboat (5 3)
27Instrument measuring resistance (8)
28A united group of people (6)
29At or in or to the adjacent residence (4 4)
30A sign saying, "The Buck Stops Here" sat on his desk (6)

Down

1Youngest President to die in office (7)
2It is designed to return to the person who throws it. (9)
3Military greeting (6)
5George W. _____, President of the United States (4)
6Activities that impart knowledge (8)
7Accused’s claim of having been elsewhere (5)
8Become or make tighter (7)
11A mentor in spiritual and philosophical topics (7)
14Relating to or associated with heat (7)
17Change or alter in form, appearance, or nature (9)
1820th President of the United States; assassinated by a frustrated office-seeker (8)
19First President to wear a beard (7)
2142nd President of the United States (7)
22An account of the author's personal experiences (6)
24Keeps on ticking (5)
26Vote against; refuse to endorse; refuse to assent (4)