Habsburg Spain was at the height of its power and cultural influence at the beginning of the 17th century, but military, political, and economic difficulties were already being discussed within Spain. In the coming decades these difficulties grew and saw France gradually taking Spain's place as Europe's leading power through the later half of the century. Many different factors, including the decentralized political nature of Spain, inefficient taxation, a succession of weak kings, power struggles in the Spanish court and a tendency to focus on the American colonies instead of Spain's domestic economy, all contributed to the decline of the Habsburg rule of Spain.