Why did the Unionist political coalition break apart after 1839?

After 1839, the Unionist coalition that had consolidated the Belgian Revolution began to fracture due to growing ideological tensions and dissatisfaction with the government's direction.12

The primary factors contributing to the coalition's collapse included:

• Religious Influence: Progressives became increasingly unhappy with the rising social and political influence of the Roman Catholic Church. This led to the formation of a national liberal party in 1846, which sought to curtail the church's power, particularly in education and public charity.12
• Monarchical Policy: There was growing discontent among progressives regarding the government, which was increasingly seen as enacting the personal policy of the monarch.12
• Political Polarization: As the debate over the church's role intensified, political attitudes became radicalized. Anticlericalism among Liberals often evolved into antireligiosity, while the defense of the church became a primary vehicle for Catholics to secure political power. This ideological divide eventually led to the formation of a distinct Roman Catholic conservative party in opposition to the Liberals.12

These developments effectively ended the era of Unionism and established the ideological polarities that defined modern Belgian politics.12