The European Great Powers of the eighteenth century managed to involve themselves in a great number of extensive conflicts of long duration. Here is a selected list, ignoring minor wars and those primarily against the Ottoman Empire and points further east. I have included links to the relevant Wikipedia pages for any readers who want to know more about the causes and consequences of each conflict.
1700—1721 Great Northern War
Russia, Poland, and Denmark vs. Sweden.
1701—1713 War of Spanish Succession
King of Spain dies with no heir.
England, Dutch Republic, Holy Roman Empire vs. France and Spain.
1718—1720 Quadruple Alliance
Britain, Dutch Republic, France, Austria vs. Spain.
1727—1729 Spanish-British War
Britain vs. Spain. Features blockade of Gibraltar.
1739—1748 War of Jenkins’ Ear
Britain vs. Spain. After 1742 included in next war.
1740—1748 War of Austrian Succession
Can Maria Theresa succeed to Habsburg rule?
Prussia, Bavaria, Spain and France vs. Austria, Britain, Dutch Republic, Sardinia.
1754—1763 French and Indian War
Britain vs. France. North American theater of Seven Years’ war, but it got started earlier.
1756—1763 Seven Years’ War
Britain, Prussia, Spain vs. France, Austria. Russia starts out with Austria and later switches sides.
Due to European colonies, possessions, and extensive trade routes, first global conflict.
1776—1783 American War of Independence
Colonists, France vs. Britain.
1789-1799 French Revolution
French vs. French.
1792—1815 Napoleonic Wars
Napoleon vs. Everybody.