The name's the same: one 
The name's the same: one in 1908 proclaimed new maritime laws, one in 1933 attempted to counteract the worldwide depression, while another one in 1866 led to the drafting of the British North America Act. One held only a year later expelled the Prussians from Luxembourg, which was declared neutral, while another one banned the merging of Schleswig and Holstein, whose succession crises it settled. More famously, two of them offered resolutions to the Belgian War of Independence. For 10 points, name these international meetings, the first of which was convened in 1830 to address Greek independence.
The name's the same: one in 1908 proclaimed new maritime laws, one in 1933 attempted to counteract the worldwide depression, while another one in 1866 led to the drafting of the British North America Act.
{London Conference} [accept any reasonable synonym of Conference; prompt on {London}]