20. B
21. B
22. B
23. B
24. B
25. A
26. B
27. B
Mostly the U.S.'s leaders were still in an "isolationist" country. The regular German would've left to serve in the Germany army.
A, 20.
The vigesimal numbering system, or base-20 numeral system, is based on the number twenty. Twenty individual numerals/digits are used, ten more than in the usual decimal system.
