now now benji, debate his ideas, don't take potshots
the main one is his description of the two prior periods, 1850s and 1930s America and how they supposedly reconfigured the political landscape...except they didn't, especially if you look beyond just who held the White House
take the post-war GOP for example, it never became a national party because it conceded the South, by 1876 it had already lost a Presidential election to the Democrats, in 1874 it had lost the House and in 1878 it would lose the Senate...it completely abandoned the freedman to the Democratic regime of the South and not so subtly tried to keep them out of the north...the Democrats gained success and became competitive again at the Presidential level by running Northern men knowing the South was locked up and that nobody cared about the negro...the GOP was also so divided between it's post-abolition wings that it never dominated the political scene, arguably the Populists were the most powerful policy movement of the era as both the GOP and Democrats adopted and enacted almost their entire platform starting in 1896...civil service reform was supported by both parties, as was backing the railroads, big business and growing militarism/imperialism
the 1930's didn't leave a unified Democratic Party either, it was instead a party of interest groups held together by FDR and briefly by LBJ, the South literally bolted multiple times and blocked every attempt at civil rights bills until LBJ forced them through in 1957 and 1964 with Republican votes, the various blocs weren't loyal, blacks went for Dewey, Eisenhower and Nixon, the blue collar "base" would split off multiple times for Eisenhower, Wallace, Nixon and Reagan, much like the blacks the fee-male vote was never locked up as a plurality in the Democratic Party until later, the "left" warred with the union base over foreign policy for almost a decade...by the time the party had cemented some of these "New Deal Coalition" parties for good, the South split off again and this time became truly competitive for both parties, allowing the GOP to recover its national standing as the population also shifted from the Northeast, the D's swapping a growing bloc in the South for the shrinking one in the NE while for many years struggling to gain hold in the West