Yes it is correct. It may not sound right, but "you and me" are object pronouns here-- she blamed us; she blamed you and me. These pronouns are used in this sentence to show who was blamed. The answer, the object of the blame is: us, especially you and me. A subject (I, you and I) in a sentence is the person doing the action. In this sentence, the doer of the action is "she," thus making the other pronouns the objects.
Benefited or benefitted are equally correct, though benefitted is more commonly used in UK English.(Spell-checkers, especially in the US, will accept only benefited.)
"We performers love correct grammar" is better!
That is the correct UK spelling, apologise with an S.But in the US, the correct spelling is apologize, with a Z.(There are a number of similar words spelled differently in UK and US usage.)
Yes, "she treated us to a great dinner" is grammatically correct English.
No, because "let's" means "let us", and it does not make sense to say "let us join us." It would be correct to say, "Come on, let's join them." It would also be correct, if you are speaking to someone outside your group, to say, "Come on, join us."
False, Germany were blamed.
The Monroe Doctrine
Border dispute
That is the correct spelling of "elector", a voter or voting representative, especially those chosen to elect a US President and Vice President.
To do so correctly is should be spelled out in full. As an abbreviation it can be the U.S.A. Using the US is more grammatically correct than using US without the definite article but both are acceptable especially in personal correspondence.
The Treaty of Guadalupe Hidalgo settled the boundary dispute between the United States and Mexico.
Benefited or benefitted are equally correct, though benefitted is more commonly used in UK English.(Spell-checkers, especially in the US, will accept only benefited.)
Spain.
Great Britain
Pinckney's Treaty
The US didn't, the Entente had blamed Kaiser Wilhelm II for the Great War.
Government will be blamed for not securing the borders enough.