How to understand "Europe and America took hundreds of years to complete the transition from feudal monarchy to bourgeois democracy;"

Here to speak of Europe and the United States, mainly Europe, the Americas are half primitive half slave society into a colonial society and then into a bourgeois democratic political society. And Europe from the feudal monarchy to the bourgeois democratic political society over a series of revolutions from the germ to complete a **** experienced a few hundred years. That is to say, the bourgeois revolution in Europe sprouted very early, in the fifteenth century (the late Middle Ages) period has begun, but due to the European religious forces, feudal forces are still too strong, the bourgeoisie's power is still too small, the assets are not yet strong. The bourgeois ideas of the populace were not advanced enough. The people of Europe were scarce, and the ideas of the gentlemen and knights were severely restricted, so that they did not have a strong idea of collective cooperation and resistance. As a result, the mass base of the many revolutions was insufficient. So until the eighteenth century did not fully enter the bourgeois democratic society.