EXCEPT that --- the US didn't have the excuse of being "state-less" or "new-state" disorganized.
Neither did Zionist Israel. By the time they declared statehood they had fully a functioning state infrastructure and military high command. The Haganah units themselves were well trained and in several cases composed of WW2 veterans from all the allied armies. All they lacked were heavy weapons and ammunition and aircraft, which arrived in the first weeks of the war. After the first truce, the Zionists were constantly on the offensive.
Not according to the history books I have read, the first heavy weapons arrived many months after the war started and had to be paid for up front. They came from Czechoslovakia, while the arab league used US weapons from the very beginning.