What common effect did the Napoleonic Wars have on the European countries of Spain, Austria, and Russia? A.
Their economies were helped by the Continental System.
B.
At some point, they all allied with Britain against Napoleon.
C.
They all had rebellions for independence from France.
D.
They used a scorched-earth policy to defeat Napoleon.

At some point, they all allied with Britain against Napoleon.

Explanation:

All these countries were united against Napoleon in his conquest of Europe. Napoleon started the wars after the French Revolution. Napoleon's campaigns began with the attack on Great Britain in 1803. Its final fall occurred in 1815 after a series of coalitions formed against France. The decisive battle took place at Waterloo.

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