When thousands of protesters descended on Washington in the summer of 2020, many brought with them hand-written posters reading “Black Lives Matter,” “Resist” – hallmark phrases of the historic outpouring of frustration over America’s slow-walking progress on racial equality. Nearly two years later, Nadine Seiler is still working to preserve these pieces of history. Donning a pink hat and a Wonder Woman necklace, the 56-year-old activist loads her car on a cold February day with more than 300 posters and banners and heads to the Enoch Pratt Library in Baltimore, Maryland. There, the pieces wil…