However, the preposition+relative pronoun (which) part becomes a relative adverb (where).

Both leaders should be brought together to bring down the curtain on generations of feuding between the two clans.

She was born in the 1950s.

Hers is a respectable family with a long history behind it.

He defected to the Soviet Union in the 1950's.

No one knows what will happen in the 1990's.

It was in the 1920s that a big earthquake destroyed Tokyo.

Taiwan was far from being any kind of economic miracle in the 1950s.

My grandfather is in his nineties.

My family came to live in Tokyo in my great-grandfather's time.

The problem of faith brings us to the Thirties and the Western love affair with communism.

I'd like to do with you but I can't afford the plane fare.

The 1990's saw various incidents.

Frankfurters were first sold in the United States in the 1860s.

Germany adopted a social security system in the 1880's.

The debate continues into the 1980s and 1990s.

The decline can be traced to the 1950s.

The research institute was established in the late 1960s.

The debate continues into the 1980s and 1990s.

The institution was established in the late 1960s.