All OSM community friends,

I have generated about 200+ small (200kb each) osm files that contain parcels polygons for a city in US, and now I am trying to find an easy way to upload multiple .osm files. Tools like JOSM or Merkaartor works great for me BUT the problem is that I don't want repeat the same work for 200 times. So I am trying to find an easier/better way to do the following steps:

1. Load the .osm xml;
2. Validate if possible (optional) like what JOSM does before upload;
3. Upload the .osm file to OSM database.

Any suggestion?

Thanks