That is partly because some Americans fear the violence is starting to spread northward, although such worries look exaggerated (see article).

ECONOMIST: Mexico and the United States

Numbers of livestock have fallen by 40%, partly thanks to an epidemic of screw worms that had spread to two-thirds of Iraq's provinces by the end of last year.

ECONOMIST: Iraq

Inflation targeting spread around the world rapidly during the 1990s and 2000s, partly due to the influence of the academic work of Mr. Bernanke and his co-authors.

FORBES: Should Bernanke Focus Only on Inflation?

Unlike western clients, who are often content to invest at home, rich Asians generally demand a global service, partly because the region's financial crisis in 1997-98 taught them to spread their risks.

ECONOMIST: Private banking in Asia

Partly because the better-known outfits get more deals, take more chances -- and spread their attention more thinly.

FORBES: Status seekers

Ash from an incinerator was spread on the paths between these allotments in Newcastle, and then found to contain hazardous, partly burned cadmium and mercury.

BBC

But Wang assumed the measures will be spread out over a few years to provide longer-term demand for solar panels and installations, partly in the hope of bridging a gap in global demand and restoring a market balance.

FORBES: China's Government To the Rescue As Solar Crisis Deepens