Based on historical perspective, the size and extent of Spanish territory complicated Philip's efforts to enforce obedience to Catholicism and his monarchy because it was too large to maintain.
The Spanish territory in which Phillips was governing during his reign between 1556 to 1598 spanned across Europe (Spain, party of France, Italy, and Netherland) to America, known as Spanish America.
Also, given that his government structure was made such that it is a single legal system with a federation of separate realms, many of his decisions on religion and politics were overruled to meet the local issues.
Hence, in this case, it is concluded that the large territories across continents, including the government structure, complicated King Phillips II's efforts to enforce obedience to Catholicism and monarchy.
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