Cultural preservation

In this 2013 photo provided by the U.S. Department of Agriculture a Kangal dog greets Ben Hofer of the Hutterite Rockport Colony near Pendroy, Mont. Nearly 120 dogs from three large breeds perfected over centuries in Europe and Asia to be gentle around sheep and children but vicious when confronting wolves recently completed a four-year study to see how they'd react to their old nemesis on a new continent. The U.S. Department of Agriculture supplied Cão de Gado Transmontanos, Karakachans and Kangals that can weigh 150 pounds (68 kilograms) to guard sheep in Idaho, Montana, Wyoming, Washington and Oregon. (Julie Young/U.S. Department of Agriculture via AP)

This undated photo released by Mexico's National Anthropology and History Institute (INAH), shows divers from the Great Mayan Aquifer project exploring the Sac Actun underwater cave system where Mayan and Pleistocene bones and cultural artifacts have been found submerged, near Tulum, Mexico. Mexican experts said Monday, Feb. 19, 2018, that the recently mapped Sac Actun cave system "is probably the most important underwater archaeological site in the world," but is threatened by pollution. (Jan Arild Aaserud/Great Mayan Aquifer Project-INAH via AP)

File - In this April 4, 2017, file photo, the fountains of Bellagio erupt along the Las Vegas Strip in Las Vegas. The union representing hotel workers in Las Vegas will ask casino-resort operators to give every housekeeper a 'panic button' as part of their new contracts. Leaders of the Culinary Union will bring the request to the bargaining table next month on behalf of 14,000 housekeepers who work on the Las Vegas Strip and the destination's downtown area. The push comes amid the #MeToo movement against sexual assault and harassment and is in line with ordinances recently approved in other cities. (AP Photo/John Locher, File)

This Jan. 23, 2018 photo provided by Tom Kawczynski shows the former Jackman, Maine town manager with the flag of New Albion, a white separatist group he leads. Kawczynski was fired from his job on Tuesday, Jan. 23, 2018. Kawczynski has made comments bashing Islam and called for the preservation of white European heritage in northern New England. (Courtesy Tom Kawczynski via AP)

This photo shows gravestones at the Jewish Cemetery on Okopowa Street in Warsaw, Poland, Friday Dec. 22, 2017. The Polish government is donating 100 million zlotys (US$ 28 million) to preserve the cemetery. (AP Photo/Czarek Sokolowski)

Poland's President Andrzej Duda, second left, hands new Prime Minister Mateusz Morawiecki, left, and Beata Szydlo talk during a ceremony at the Presidential Palace in Warsaw, Poland, Monday, Dec. 11, 2017. Morawiecki is to focus on developing Poland's economy and improving the government's image abroad. (AP Photo/Czarek Sokolowski)