The American Le Mans Series became the first racing event to use the protocols in its Green Challenge competition.

VOA: special.2009.11.03

Soon after his death, Roberto Clemente became the first Latino player to be included in the Baseball Hall of Fame.

VOA: special.2010.04.11

The vaccine did not lower the amount of virus in the blood of volunteers who became infected during the study.

VOA: special.2009.10.13

The band became so popular that in nineteen sixty-six John Lennon said they were more popular than Jesus Christ.

VOA: special.2010.07.30

With the coming of Mexican independence, the Santa Fe Trail became the major trade link between the two countries.

VOA: special.2009.03.30

After several weeks, it became clear that the Senate would approve President Garfield's choice for the tax collector's job.

VOA: special.2010.04.22

She never became famous for her discoveries because she often sold her fossils to get money to support her family.

VOA: special.2009.05.13

This week,Kim Jong Un and his aunt, the sister of Kim Jong Il, became four-star generals with little military experience.

VOA: special.2010.10.02

And since it was eighteen eighty-eight -- a presidential election year -- the tariff became an important election issue.

VOA: special.2010.05.20

At least three Indian tribes were living in the area that became Charleston when Spanish explorers arrived in Fifteen-Twenty-One.

VOA: special.2010.10.04

His theory of Martian life became so complex that he made maps of cities and waterways on the planet.

VOA: special.2010.07.11

I did not intend to fight unless it became necessary in self-defense and in the performance of official duty.

VOA: special.2010.02.15

Air Force pilot Gordon Cooper became an expert on the Redstone Rocket that would launch Mercury astronauts on short training flights.

VOA: special.2009.06.10

At the age of six or seven years old, Emmanuel became a soldier for the Sudan People's Liberation Army.

VOA: special.2009.10.14