Chartism was the high-water mark of Irish-English working class solidarity.

Evidence

Chartism, however, proved to be the high point of cooperation between the Irish and English elements of the working classes in England. This movement, organized behind a People’s Charter, the platform of universal suffrage, annual parliaments, and parliamentary salaries; and represented by demonstrations, petitions, riots, and rebellions, though neither politically nor ideologically homogeneous, had once held the promise of an enduring organization. Instead, it collapsed totally, from within and without. After the late 1840s, the tentative efforts that might have resulted in a politically significant class solidarity were frustrated by events of both political and economic character. — Cedric J. Robinson, Black Marxism_ The Making of the Black…, 259

Categorization

• QUESTION: Worth chasing: what exactly were the ‘events of both political and economic character’ that frustrated class solidarity after the late 1840s?