Hi!
I'm an American student as well, and I've applied to five British universities through UCAS:
University of Edinburgh (International Relations)
St. Andrews (International Relations + French)
Cambridge (Politics)
LSE (International Relations)
KCL (European Studies + French)
I submitted my application on October 14, and I've received unconditional offers from Edinburgh and St. Andrews, a conditional offer from KCL (I'll make the condition easy), and a rejection from Cambridge, which I knew was a long shot from the beginning.
I originally applied to four schools through UCAS, and was debating either UCL or KCL as my last choice. I finally decided on KCL because I loved their European Studies program, but as I read more and more about the two schools, I'm regretting my decision more and more. It would be my dream to go to LSE, but that's just as much of a long shot as Cambridge.
Stats:
APs - 5 on Spanish Language and French, 4 on English Literature (taking Spanish Lit, English Lang, Calc AB, and APUSH exams this year)
SAT IIs - 760 on Lit, 740 on Spanish, 630 on Math (yikes)
ACT - 33
GPA - 4.3
I attend a rigorous college prep high school in the US and did a year abroad in France.