#11: Those are all incorrect for AE as well.
Heißt das, das man zum perfekten Abschluss einer formalen Vorstellung bei einem Amerikaner "Nice to meet with you"" sagen sollte?
No. In AE, if you "meet someone," you have met them for the first time. Or, you can "meet someone" somewhere, such as "under the big clock" or at a restaurant, etc. That is where you come together and greet each other.
However, to "meet with someone" means that you, say, have a conversation with them or have a meeting, or even have dinner together.
As far as AE dropping prepositions: One of my pet peeves of BE translators who think that they are translating into AE is that they will write "X and Y agreed the following" or "the agreed measures..." etc. AE almost always requires a preposition (or some other element) after "agree(d)".
Definition of agree
1a : to concur in (something, such as an opinion) : admit, concede They agreed that he was right.
b : to consent to as a course of action She agreed to sell him the house.
2 chiefly British : to settle on by common consent : arrange … I agreed rental terms with him …— Eric Bennett