When you go for the US embassy interview you will be given an interview only after you have passed your interview.
The first American embassy was established in 1929
First embassy(consulate) was established in 1790 at Liverpool England.
Yes, if you answer differently from the 1st time at the US embassy they can know because they usually record most of these interviews.
London
yes. If interviewer is offering hand first then we should shake hands firmly. but we should not initiate first for handshake.
Iran i think
china
While there is no one correct first question, generally, the interviewer will ask the candidate to broadly speak about him/herself. First interview questions may include "Tell me a little about yourself", "Walk me through your resume", or "Explain what led you to this job interview".
To write a letter to the British embassy you first put your address. Next you put the date you are writing the letter then the address of the British embassy before finally writing the content of the letter.
See the answer to this questionWhat_should_you_prepare_before_interviewingfor some ideas.
Well, first you obveously have to get an interviewer. Then, always act natural.
Yes, the US embassy records all interviews and can therefore refer to the answers during the interviews.