One would assume that the unfolding crisis in Gaza would engender more division in the US. But historically, crisis in the Middle East has tended to have a unifying effect, if presidential approval ratings are used as a proxy for unity. A higher approval rating generally means a more united nation. However this is only observed for Middle East conflicts or if Islam is implicated: there was no bump in unity during the Vietnam War, the Yugoslav Wars, or the Russia-Ukraine war.
Jimmy Carter’s approval ratings doubled from 30% to 60% during the Iran hostage crisis:
However, Reagan got no bump from the 1983 Beirut barracks bombings.
George W. Bush got a major boost after 911, but less so during the 2003 invasion of Iraq:
His dad’s approval ratings peaked at 90% shortly after the Gulf War, only to fall by half a year later:
Israel is seen by some as an extension of America, so Israel being under attack is a cause for unity. It will be interesting to see how this unfolds.