the polarization of the american congress (in the 90's) happened in large part because the amount of time congress members spent in each other's company went wa

the polarization of the american congress (in the 90's) happened in large part because the amount of time congress members spent in each other's company went way down. this is at least the explanation i've gotten from people who worked in the congress. so, it seems like that is at least one data point that supports your argument.