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The lines stayed mostly static for the next four years, with Paris experiencing the occasional bombardment from enemy aircraft and the giant "Big Bertha" long-distance artillery guns. The city's hedonistic life survived for a while before being subdued by the bloodshed on the front and the impact of rationing and a devastating flu epidemic in 1916. The war was finally ended by the Armistice of 11 November 1918, signed at Compiegne to the northeast of Paris.

Under de Gaulle's successors, Georges Pompidou and Valéry Giscard d'Estaing, Paris underwent major physical development. The radical Centre Pompidou was built along with the ultra-modern complex at La Villette (originally an abattoir, now a science museum).

Paris is the capital city of France, as well as the capital of the Île-de-France région, whose territory encompasses Paris and its suburbs. The city of Paris proper is also a département, called Paris département (French: département de Paris).

France's political divisions were a major factor in its ill-preparedness for the outbreak of the Second World War on 3 September 1939. Some of the Catholic Right were openly hostile to parliamentary democracy, Socialism and Communism, and welcomed the possibility of a fascist regime, even imposed by foreign forces.

Tensions were high, and led to the largest abuse in the city's postwar history, when the Paris police, told wrong news about policemen having been murdered by independentists, massacred an estimated 300 pro-independence demonstrators on 17 August 1961; remarkably, the event, though known in some circles, was largely ignored until the 1990s. (See Paris massacre of 1961)

The discontented Parisian population was ripe for an uprising, and on 22 February 1848 it duly came when troops fired on demonstrators. Louis Philippe abdicated and was replaced by a Second Republic. Nationwide elections returned a conservative government which opposed any reforms. The Parisian workers rose again only to be massacred by General Cavaignac, with some 5,000 people being killed in the fighting and subsequent reprisals. Fresh elections were held at the end of 1848.

Napoleon's brief return from exile in 1815 saw him pass through Paris, en route to destiny at Waterloo on 18 June. His replacements, the restored Bourbon monarchs Louis XVIII (1814, 1815-1824) and Charles X (1824-1830), managed between them to provoke yet another revolution in Paris, confirming the saying that the Bourbons could "learn nothing and forget nothing."

The French Revolution effectively began in Paris, which the king had garrisoned with foreign troops to quell any unrest. On 13 July 1789 a hitherto unknown lawyer named Camille Desmoulins sparked the revolt when he jumped on a café table in the Palais-Royal and denounced Louis XVI's dismissal of his minister, Jacques Necker, who was widely seen as the only honest man in the government. Desmoulins ended his speech with the call "Aux armes!" ("To arms!").

When Hitler invaded France on 14 May 1940 it took the German army only a month to reach Paris, invading through neutral Belgium around the Maginot Line, where the French defenses were massed. Paris fell with virtually no resistance on 14 June. Much of the city's population fled, with 1.6 million of its 3.5 million people leaving between May and June 1940.

The arrival in Paris of the Industrial Revolution prompted the city's breakneck growth, with migrant workers arriving from the countryside on newly-constructed railway lines. By now its population was over 900,000 people, making it one of the largest cities in Europe and far surpassing any other city in France (the next largest, Lyon and Marseille, had only about 115,000 each).

In 1900 Paris hosted the 1900 Summer Olympics. In late August 1944 after the battle of Normandy, Paris was liberated when the German general Dietrich von Choltitz surrendered after skirmishes to the French 2nd Armoured Division commanded by Philippe de Hauteclocque backed by the Allies.

Paris is densely covered by a metro system, the Métro, as well as by a large number of bus lines. This interconnects with a high-speed regional network, the RER, and also the train network: commuter lines, national train lines, and the TGV (or derivatives like Thalys or Eurostar for specific destinations). There are two tangential tramway lines in the suburbs: Line T1 runs from Saint-Denis to Noisy-le-Sec, line T2 runs from La Défense to Issy. A third line along the southern orbital road is currently under construction.