Rule reminder
'Cosicché' and 'sicché' are single-word consecutive conjunctions used in formal, literary, and journalistic Italian. They introduce a result clause directly (no correlative in the main clause needed) and take the indicative. 'Così che' (two words) is an older/literary variant.
Il trattato non fu ratificato in tempo, _____ il progetto rimase senza finanziamenti.