The British Library in London has been digitizing its awesome collection of (mainly British) newspapers for some years and many are now freely available to staff and students at British higher and further education institutions. Subject searches trawl the entire collections. The best way into them is probably via this page. This has massively reduced the dependence of historians on the (still very useful) Times Digital Archive, 1785-2019. See also Gale Historical Newspapers for far more.