America supplies Israel with much of its military equipment, for instance the Iron Dome systems that were used recently to stop mortars launched by Hamas in the recent Gaza conflict. America also has deep financial ties with Israel, long held political ties with Israel, and very simply, personal ties in that America is also home to one of the biggest jewish communities outside of Israel.
I do agree with you though, Israel is not a weak nation. They have never needed America's direct support to fend off muslim aggression. Nevertheless America should continue to aid Israel. Israel's requests of America have never been unreasonable.
NOt quite, Iorn dome is 100% Israeli designed and developed, all the US have done is given funding for dozens more systems, with the agreement that the production is shared with American companies, which again highlights my point I was making in the previous post, that the money the US provides is simply re-directed into US companies.