More came every year. By the eighteen seventies, California's political leaders were demanding an end to further immigration from China.

VOA: special.2010.05.20

It says salt in the American diet has increased fifty percent since the nineteen seventies, while blood pressures have also risen.

VOA: special.2010.01.27

The researchers note that farmers in the Midwest used too much fertilizer on their crops through the nineteen seventies.

VOA: special.2009.07.28

The Modern Jazz Quartet continued to perform all over the world for sold-out crowds until the late nineteen seventies.

VOA: special.2009.03.01

A movement to spread the use of the kangaroo method for preterm babies grew out of Bogota,Colombia, in the nineteen seventies.

VOA: special.2009.05.25

The writer began giving early versions of his books and drawings to the library beginning in the nineteen seventies.

VOA: special.2009.10.05

But by the late nineteen seventies and the nineteen eighties, those countries no longer had much money to help farmers.

VOA: special.2010.03.23

In the late nineteen seventies, music producer Sylvia Robinson realized that hip-hop was becoming a popular part of street celebrations.

VOA: special.2009.10.14

In the nineteen seventies, a supervisor asked her if she would like to do clinical research about pain.

VOA: special.2010.05.04

USA Track and Field Hall of Famer, Bill Bowerman, is credited with bringing jogging to the United States in the nineteen seventies.

VOA: special.2010.06.08

He left New York for Los Angeles,California in the nineteen seventies to find success in the film industry.

VOA: special.2010.03.12

The treadle pump is based on a design developed in the nineteen seventies by Norwegian engineer Gunnar Barnes.

VOA: special.2009.08.17

It was not until the nineteen seventies that Henrietta Lacks' family learned that her cells had been taken and used by scientists.

VOA: special.2010.07.21

Most of the shooting incidents between professional lawmen and outlaws took place during the eighteen seventies in Texas.

VOA: special.2010.03.10

Ted Fujita was a weather expert who developed a system to rate tornados in the nineteen seventies.

VOA: special.2011.04.19

Surprisingly, people in their seventies and eighties were least likely to report feeling negative or harmful emotions.

VOA: special.2010.08.03

So in the nineteen seventies, the national media began calling the city The Mistake on the Lake.

VOA: special.2010.03.21

The first serious research studies into bullying were done in Norway in the late nineteen seventies.

VOA: special.2010.04.22

Sony Corporation official Norio Ohga helped to develop the compact disc in the late nineteen seventies.

VOA: special.2011.05.11

African-American singers recording for the company were extremely popular in the nineteen sixties and nineteen seventies.

VOA: special.2010.03.21

In the nineteen seventies, the group changed record companies and shortened their name to the Jacksons.

VOA: special.2009.07.05

In this book he describes his efforts to restart diplomatic ties with China during the presidency of Richard Nixon in the early nineteen seventies.

VOA: special.2011.07.13

Rockers Ann and Nancy Wilson from the nineteen seventies band Heart also took to the stage.

VOA: special.2010.08.02

In the mid nineteen seventies Eartha Kitt slowly began to rebuild her career in America.

VOA: special.2009.06.07

Popular games during the late seventies and early eighties included Space Invaders, Asteroids,Defender and Pac-Man.

VOA: special.2011.02.23

Some say it is his best. Kahn built this museum in the early nineteen seventies.

VOA: special.2009.12.13

The English explorer James Cook came looking for this undiscovered continent in the seventeen seventies.

VOA: special.2009.06.03

Asian carp were brought to the United States in the nineteen seventies as a solution.

VOA: special.2009.12.15

He was a strong voice for ending America's war in Vietnam in the nineteen seventies.

VOA: special.2009.09.13