Final answer:
The anti-immigration movement has become more important throughout 2019 as a reaction to the influx of immigrants and refugees. Anti-immigration activists have targeted the demographic trends of increased immigration since the 1970s.
Step-by-step explanation:
One vaguely-defined social movement that has become more important throughout 2019 can be considered a reaction or response to the influx of immigrants and refugees from other countries. The movement is often referred to as the anti-immigration or anti-immigrant movement.
Anti-immigration activists have targeted the demographic trends of increased immigration since the 1970s, leading to a larger military and border patrol presence and the media's focus on crimes committed by immigrants.
Examples of recent protests and resistance to immigration include the rise of ultranationalist groups in the United States and Europe in response to the refugee crisis in the Middle East and Africa and the migrant crisis at the U.S.-Mexico border.