In 1975, 42 percent of Americans hosted friends or family at home at least monthly. In 2026, that number is 12 percent — a 70 percent collapse in a half-century. New polling from Data For Progress, replicating the DDB Needham Life Style surveys that Robert Putnam used in Bowling Alone, confirms that the trajectory he warned about in 2000 has not only continued but accelerated. The ancient practice of visiting with friends is approaching functional extinction in American life. The data is comprehensive and brutal. Double-digit declines hit practically every measure of socializing over the past 30 years: playing cards, attending sporting events, going to bars, volunteering, working on community projects. The share hosting or attending dinner parties dropped an additional 20 percent since 1995 — stacked on top of the declines Putnam already considered alarming. The share saying they never entertain at home has tripled since the 1970s. Americans haven't moved their social lives to restaurants or bars; the restaurant industry reports a sharp increase in solo dining. Face-to-face socializing has declined across the board. Four interlocking structural forces explain the collapse. First, the harried leisure class effect identified by economist Staffan Burenstam Linder in 1970: as perceived value of time rises, Americans optimize for activities that can be half-attended while multitasking — Netflix at 9pm while answering email — over the multi-hour coordination overhead of hosting. Second, the entry of women into the labor force past 50 percent participation in 1970 eliminated the unpaid household social coordinator role, and men did not pick up the slack. Between 1975 and 1998, mothers increased time with children by 200 minutes per week; fathers' parenting time rose even more. Evenings once spent hosting adults are now spent with children. Third, the friendship base required for hosting is eroding. Average close friendships are declining with each generation, most steeply among Americans without a college degree. Thirty-nine percent of non-college Americans say they never entertained at home in the past year. Hosting is becoming a luxury good — a class marker rather than a universal social practice. Fourth, time spent at home has exploded since the 2010s, but that time is consumed by screened media, not social contact. Average home time increased by nearly two hours per day from 2003 to 2022. The class and political dimensions deserve close attention. The two groups most likely to report never entertaining were political independents (44 percent) and people without a college diploma (39 percent). Derek Thompson's analysis inverts the usual causal arrow on political fragmentation: rather than polarization causing social isolation, the erosion of social networks may be driving detachment from all group affiliations, including political parties. People unembedded in strong social networks don't join groups of any kind. The optimistic counter-narrative — that Americans exercise more, attend more concerts, travel more — doesn't survive scrutiny. The exercise boom is mostly solo: gym sessions with podcasts, basement yoga mats. Running clubs exist but represent a fraction of exercise time. Concert attendance and travel cannot offset the disappearance of routine, low-cost social infrastructure. You cannot replace a weekly dinner with neighbors with an annual trip to Bonnaroo. The 20-year projection is stark. If current trends hold, monthly home hosting drops below 5 percent by the mid-2040s. The social infrastructure that once produced community trust, neighborly obligation, and informal mutual aid — the connective tissue of democratic society — will exist only in affluent, educated enclaves. America will have completed its transformation from a society of hosts to a society of spectators, each cocooned in a personalized entertainment fortress with the door firmly shut.