It was moving and empowering to see so many women and some men participating in the “Women’s March” that took place in most major cities in the US as well as many big cities in the world on January 21, 2017, one day after the inauguration of the 45th president of the US. It showed women’s solidarity against many of the policies professed by Donald Trump, the newly inaugurated President of the United States, that are likely to exacerbate the social and environmental problems in the U.S. as well as in the world, such as accelerated climate change, racial injustice, violation of women’s rights and so on. It was estimated that 4.8 million people participated in this massive demonstration worldwide. According to the crowd scientists at Manchester Metropolitan University in Britain, almost 3 times as many people showed up for the women’s march compared with Trump’s inauguration at their peak time near the National Mall. This coordinated protest demonstration showed that women together with other women can resist social injustice. I hope that women will be able to use this empowering show of force to enact social and political change for the better (not merely change for the change’s sake) from this time on.