Due to the spread of COVID-19, shipments to certain countries/regions are currently restricted. Also, shipping delays are also expected due to decreased transportation capacity.
https://www.post.japanpost.jp/int/information/2020/0618_01_en.html

23/04/2020 Update: Japan Post doesn't accept any air parcel to United States of America. 

18/06/2020 Update: Resumption of EMS and parcel-post/letter-post items by air destined to the following countries: Estonia, Austria, Croatia, Sweden, Spain, Slovenia, Czech Republic, Denmark, Norway, Hungary, Bulgaria, Belgium, Poland, Portugal, Latvia, Lithuania, Luxembourg

Fedex is available to ship to USA and Canada, please check shipping section, monthly shipping and My Warehouse options for more informations