That is the common knowledge that everyone seems to share, but it is pure balderdash. Israel exists in spite of the lack of "critical" support from the USA or anyone else. Currently our government is doing everything they can to put Israel in danger of being nuked by Iran. We have broken every mutual defense agreement we ever had with them. The real reason Israel has a better chance of survival than Texas is they have Nukes and the will to use them.(Samson Option, not Masada)
Well, I happen to think that the USA’s support for Israel has been critical for its survival, and continues to be today.