If people outside the United States are looking for answers why Americans often seem so clueless about the world outside their borders, they could start with what the three major U.S. television networks offered their viewers in the way of news during 2013.

Syria and celebrities dominated foreign coverage by ABC, NBC, and CBS – whose combined evening news broadcasts are the single most important media source of information about national and international events for most Americans. Vast portions of the globe went almost entirely ignored, according to the latest annual review by the authoritative Tyndall Report.

Latin America, most of Europe and sub-Saharan Africa, South Asia apart from Afghanistan, and virtually all of East Asia – despite growing tensions between China and Washington’s closest regional ally, Japan – were virtually absent from weeknight news programmes of ABC, NBC, and CBS last year, according to the report, which has tracked the three networks’ evening news coverage continuously since 1988.

Out of nearly 15,000 minutes of Monday-through-Friday evening news coverage by the three networks, the Syrian civil war and the debate over possible U.S. intervention claimed 519 minutes, or about 3.5 percent of total air time, according to the report.

That made the Syrian conflict and the U.S. policy response the year’s single-most-covered event. It was followed by coverage of the terrorist bombing by two Chechnya-born brothers that killed three people at the finish line of last April’s Boston Marathon (432 minutes); the debate over the federal budget (405 minutes); and the flawed rollout of the healthcare reform law, or Obamacare (338 minutes).

The next biggest international story was the death in December of former South African President Nelson Mandela (186 minutes); the July ouster of Egyptian President Mohamed Morsi and its aftermath; the coverage of Pope Francis I (157 minutes, not including an additional 121 minutes devoted to Pope Benedict’s retirement and the Cardinals’ conclave that resulted in Francis’ succession); and the birth of Prince George, the latest addition to the British royal family (131 minutes).

The continued fighting in Afghanistan came in just behind the new prince at 121 minutes for the entire year.

The strong showings by the papal succession, Mandela’s death, and Prince George’s birth all demonstrated the rise of “celebrity journalism” in news coverage, Andrew Tyndall, the report’s publisher, told IPS. He added that “a minor celebrity like Oscar Pistorius (the South African so-called “Bladerunner” track star accused of murdering his girlfriend) attracted more coverage [by the TV networks – 51 minutes] than all the rest of sub-Saharan Africa in the [11] months before Mandela’s death.”

Surveys by the Pew Research Centre for the People & the Press, among other polling and research groups, show that about two-thirds of the general public cite television as their main source for national and international news, more than twice the number of people who rely on newspapers, and about one-third more than the growing number of individuals whose primary source is the internet.

An average of about 21 million U.S. residents watch the network news on any given evening. While the cable news channels – CNN, FoxNews, and MSNBC – often get more public attention, their audience is actually many times smaller, according to media-watchers.

“In 2012, more than four times as many people watched the three network newscasts than watched the highest-rated show on the three cable channels during prime time,” Emily Guskin, a research analyst for the Pew Research Centre’s Journalism Project, told IPS.

As in other recent years, news about the weather – especially its extremes and the damage they wrought – received a lot of attention on the network news, although, also consistent with past performance, the possible relationship between extreme weather and climate change was rarely, if ever, drawn by reporters or anchors.