What comes first, Geometry 1 or Algebra 2?

This is highly dependent upon where you attend school, what schooling plan you follow (I.E, achievement diploma, AP, IB diploma, etc), and whether or not you take classes in conjunction or separately. However, in general, the high school mathematics curriculum is: Algebra 1, geometry, algebra 2, pre-calculus, calculus and/or statistic.
This can vary, however, with the algebras being placed together, with geometry following algebra 2, as truly the three classes are all foundational to pre-calculus and calculus, so the order often isn't particularly important.

http://712educators.about.com/od/mathematics/a/math_studyplan.htm
https://en.wikipedia.org/wiki/Secondary_education_in_the_United_States

Agreed. 15 years ago, at our high school it was A1, A2, G. Now it is A1, G, A2.

And in some other parts of the world we teach a spiral curriculum which covers all areas each year, with increasing complexity.

[k-10syllabus.det.wa.edu.au/content/syllabus-documents/early-adolescence-8-10-mathematics-syllabus, no longer online]