Brittany and Wales both independent countries

Alternate Time-Line: Brittany becomes an independent from France at any time between 1815 and 1914, either in 1815 or in 1871.
In Wales, industrialisation takes place in a way that does not harm the Welsh language, and in the 1890s, LLoyd George and Tom Ellis's dreams of Cymru Fydd becoming a Parnell style Home Rule party slowly materialize and by 1910, LLoyd George is leading such a party in the House of Commons, and forces Asquith to consider Home Rule. Somehow, without Lloyd George being the chancellor of the Ex-checker to introduce the People's Budget, the House of Lords still gets it power of veto reduced by someone other than him, and Wales gets it Home Rule in 1912, unlike Ireland, whose Home Rule only gets passed in 1914 and suspended because of the war (as in OTL.) Lloyd George, stands for election for the devolved Welsh House of Commons and becomes the First First minister of Wales. Without him to replace Asquith as Prime Minister of the United Kingdom, Bonar Law becomes Prime Minister during the War to replace Asquith and after the war, it is a conservative majority government which rules the country and fights the Irish war of independence in a more brutal way than LLoyd George in OTL. Many Cymru Fydd politicians in the Welsh devolved Parliament are dissolusioned with the Conservative government and its policies in Ireland, and argue for a declaration of independence arguing that Wales can pay its way as it has a lot of industry. LLoyd George secretly hopes for the Declaration not to gain a majority, but it does and LLoyd George then supports the new 'Welsh Republic'. The Tory Government in Westminster refuses to recognise it, and Wales fights with Ireland against the UK in which an Irish Free state and a Welsh Free state have dominion status. Wales, like Ireland, later becomes a Republic.

How would Brittany and Wales relate to each other from the 1920s onwards if they were both independent states?
 
Alternate Time-Line: Brittany becomes an independent from France at any time between 1815 and 1914, either in 1815 or in 1871.
In Wales, industrialisation takes place in a way that does not harm the Welsh language, and in the 1890s, LLoyd George and Tom Ellis's dreams of Cymru Fydd becoming a Parnell style Home Rule party slowly materialize and by 1910, LLoyd George is leading such a party in the House of Commons, and forces Asquith to consider Home Rule. Somehow, without Lloyd George being the chancellor of the Ex-checker to introduce the People's Budget, the House of Lords still gets it power of veto reduced by someone other than him, and Wales gets it Home Rule in 1912, unlike Ireland, whose Home Rule only gets passed in 1914 and suspended because of the war (as in OTL.) Lloyd George, stands for election for the devolved Welsh House of Commons and becomes the First First minister of Wales. Without him to replace Asquith as Prime Minister of the United Kingdom, Bonar Law becomes Prime Minister during the War to replace Asquith and after the war, it is a conservative majority government which rules the country and fights the Irish war of independence in a more brutal way than LLoyd George in OTL. Many Cymru Fydd politicians in the Welsh devolved Parliament are dissolusioned with the Conservative government and its policies in Ireland, and argue for a declaration of independence arguing that Wales can pay its way as it has a lot of industry. LLoyd George secretly hopes for the Declaration not to gain a majority, but it does and LLoyd George then supports the new 'Welsh Republic'. The Tory Government in Westminster refuses to recognise it, and Wales fights with Ireland against the UK in which an Irish Free state and a Welsh Free state have dominion status. Wales, like Ireland, later becomes a Republic.

How would Brittany and Wales relate to each other from the 1920s onwards if they were both independent states?

Not going to happen. Not with a PoD that late.
 
How is this POD too late?

Wales was under English domination for hundreds of years by the 19th Century, at least until the conquest by King Edward I. After this, it was already too integrated into the English administration for any "independence movement to gain traction". Not sure about the details of the specific context you mentioned, but Home Rule was different from independence.

Regarding Brittany, likewise it was too integrated into the French monarchy, despite strong cultural peculiarities for a long-lasting independence move to succeed. If it was broken appart in either 1815 or 1871, as soon as France regained any strength it would reannex it. If they went to war against Germany to get back Alsace-Lorraine, they will do it for Brittany, unless the whole country was balkanized into different polities... which I must admit would be an interesting TL.
 
In Wales, industrialisation takes place in a way that does not harm the Welsh language

That's basically impossible considering that about 3/4s of the workforce in the Valleys were immigrants from mining communities in England by the turn of the 19th Century. Wales just doesn't have the population base to replace those numbers, nor the capability to prevent them turning up.
 
That's basically impossible considering that about 3/4s of the workforce in the Valleys were immigrants from mining communities in England by the turn of the 19th Century. Wales just doesn't have the population base to replace those numbers, nor the capability to prevent them turning up.

Don't you mean the turn of the twentieth century. And are you sure it was quite that much? My impression is that in Glamorgan it was q significant minority who were English born but not quite that much? You must also remember that until the 1880s and even 1890s industrialisation was working fine for the Welsh language in the valleys. In Cardiff and Monmouthshire it the change happened more in the 1860s with the latter happening due to the demise of iron and its replacement with coal, resulting in Welsh outmigration and English immigration. In ATL, all you need is for Monmouthshire to continue with iron and not coal and for Glamorgan to attract fewer English migrants between 1880 and 1914. Remember that there were also 100,000 North Wales Welsh speakers in Liverpool by 1910. Have most of them go south instead to reinforce Welsh there and Bob's your uncle.
 
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