King Louis XIV of France emerged from the Franco-Dutch War

King Louis XIV of France emerged from the Franco-Dutch War in 1678 as the most powerful monarch in Western Europe, but ----- he had expanded his
realm, the 'Sun King' remained unsatisfied.

A) just as
B) as if
C) unless
D) since
E) although

Could you explain me why the key is E?

Hello Volcano1985

It's used to express an unexpected resultor contrast:

• He remained unsatisfied even though he expanded his realm.

Quote:

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Originally Posted by Soup

Hello Volcano1985

It's used to express an unexpected resultor contrast:

• He remained unsatisfied even though he expanded his realm.

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What is "but" to be then?

But is a coordinating conjunction. It joins two sentences. Although is a subordinating conjunction. It heads a dependent clause.